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A299119 as a simple table

na(n)
11
22
36
414
540
684
7224
8484
91134
102480
115632
1212036
1326624
1456896
15122640
16261078
17557056
181176876
192490368
205237360
2111008704
2223057408
2348234496
24100635144
25209714400
26436154368
27905962860
281878931264
293892314112
308052800160
3116642998272
3234359209436

[1,2,6,14,40,84,224,484,1134,2480,5632,12036,
 26624,56896,122640,261078,557056,1176876,2490368,
 5237360,11008704,23057408,48234496,100635144,
 209714400,436154368,905962860,1878931264,
 3892314112,8052800160,16642998272,34359209436]